BMW Thermostats for BMW 3 Series E46 (1999-2005)

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BMW thermostats are known to fail, but luckily they typically fail wide open - meaning that your car can still cool. We offer thermostats from various OE suppliers we trust along with upgraded motorsport specific thermostats where applicable to make sure your BMW stays cool on track.
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Thermostat Replacement Kit - E46 M3
10X Entries Into Our F80 M3 Sweepstakes
Packaged by Turner - Corporate Logo
T#:554082
Part#: 11531318274KT2
Ships in 3 Business Days
$ 139.99

This product was last offered at the strikethrough price on
09-26-2026

$ 110.99 USD
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$ 110.99 USD
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When it comes time to replace your thermostat, be sure you have everything you need. This kit includes everything you need to replace your thermostat, including the thermostat.

Kit includes:

  • Thermostat
  • Thermostat O-Ring
  • 1.5 Liters of coolant

 

This item fits the following BMWs: 
2001-2006 E46 BMW M3 

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Packaged by Turner - Corporate Logo
T#:554073
Part#: 11537509227KT3
Back Ordered
$ 114.99

This product was last offered at the strikethrough price on
09-16-2026

$ 103.99 USD
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$ 103.99 USD
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When it comes time to replace your thermostat, be sure you have everything you need. This kit includes everything you need to replace your thermostat, including the thermostat.

Kit includes:

  • Mahle-Behr thermostat with gasket
  • Thermostat mounting hardware
  • 1 liter of coolant

Applications:
1999-2003 E39 528i, 525i, 530i sedan, touring wagon (M52TU engine, M54 engine)
1999-2005 E46 323, 328, 325, 330 sedan, coupe, cabrio, touring wagon (M52TU engine, M54 engine)
2004-2005 E60 525i, 530i sedan, touring wagon (M54 engine)
2001-2006 E53 X5 3.0 (M54 engine)
2004-2006 E83 X3 2.5i X3 3.0i (M54 engine)
1999-2002 Z3 2.3. Z3 2.5i, 2.8 Z3 3.0i (M54 engine)
2003-2005 Z4 2.5i, Z4 3.0 (M54 engine)

 

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Cooling System Refresh Kit - Level 1
10X Entries Into Our F80 M3 Sweepstakes
Packaged by Turner - Corporate Logo
T#:15744012
Part#: 32411712735-KT
In Stock
Sale - Save 5% $ 670.99

This product was last offered at the strikethrough price on
09-09-2026

$ 636.66 USD
Free Shipping on orders $49 and up
Sale - Save 5%
$ 670.99

This product was last offered at the strikethrough price on
09-09-2026

$ 636.66 USD
Free Shipping on orders $49 and up
Stop the problems before they arise. If you vehicle has 60,000 miles or more, replace all of these components to ensure that your vehicle stays healthy. To keep everything in top order, continue to replace these components at 60,000 mile intervals. Water pump failure, cracked plastic housings, and expansion tank leaks will not be a concern once all these problem parts are replaced. Included in this kit are the following parts. Rein Water Pump with metal impeller FAE Fan Switch Vaico Q+ thermostat - made in Germany! New O-ring Sealing Gaskets OEM Expansion Tank & Cap 1 Gallon Coolant Rein Upper & Lower Radiator Hoses
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Wahler - Corporate Logo
T#:341054
Part#: 11537509227
Ships in 1-2 days
$ 82.50

This product was last offered at the strikethrough price on
09-16-2026

$ 71.99 USD
Free Shipping on orders $49 and up
$ 71.99 USD
Free Shipping on orders $49 and up
Stop leaks before they start with this new Thermostat With Housing from Wahler. Despite the fact that most BMW models are brilliant, most have common issues that can plague you during your ownership of the car. This part is one of those issues, as they are known to crack over time. This replacement part is perfect stop a crack and possibly a leak before it starts.
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Wahler - Corporate Logo
T#:360524
Part#: 11531318274
In Stock
$ 105.99

This product was last offered at the strikethrough price on
06-25-2026

$ 93.99 USD
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$ 93.99 USD
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Replacement 80* Celcius thermostat for E46 M3, Z3M w S54 engine, Z4M. The thermostat can be replaced on the E46 M3 without removing the water pump. This can save you money if the pump still has life left on it but the thermostat needs to be done now. Symptoms of a bad thermostat include an erratic temp gauge and a fault code. When replacing the thermostat, there are three o-rings that will likely need to be replaced between the thermostat and the water pump housing, and two on the coolant tube going to the head. We also recommend new hoses, clamps, and BMW coolant. Replacement should take about one hour.
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URO Thermostat Assembly With Aluminum Housing
2X Entries Into Our F80 M3 Sweepstakes
URO Premium - Corporate Logo
T#:37858365
Part#: 11537509227PRM
In Stock
$ 89.99 USD
Free Shipping on orders $49 and up
$ 89.99 USD
Free Shipping on orders $49 and up
Get rid of the brittle plastic OEM thermostat housing when replacing the thermostat with this Aluminum Housing alternative! Comes with thermostat and gasket.

Genuine BMW - Corporate Logo
T#:360689
Part#: 11537509227
Ships in 1-2 days
3% off MSRP $ 174.45

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 169.69 USD
Free Shipping
3% off MSRP
$ 174.45

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 169.69 USD
Free Shipping
Thermostat With Housing
10X Entries Into Our F80 M3 Sweepstakes
Bremmen Parts - Corporate Logo
T#:26494584
Part#: 11537509227
In Stock
Sale - Save 25% $ 60.99

This product was last offered at the strikethrough price on
05-03-2026

$ 45.99 USD
Free Shipping on orders $49 and up
Sale - Save 25%
$ 60.99

This product was last offered at the strikethrough price on
05-03-2026

$ 45.99 USD
Free Shipping on orders $49 and up

Genuine BMW - Corporate Logo
T#:12502
Part#: 11531318274
In Stock
16% off MSRP $ 147.44

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 123.15 USD
Free Shipping
16% off MSRP
$ 147.44

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 123.15 USD
Free Shipping
GENUINE BMW THERMOSTAT - E46 M3, MZ3 (S54), MZ4. This is just the thermostat itself and does not include the housing o-ring or any others that are advised for replacement. See thermostat kit or our water pump kit for a complete package.

When doing any sort of repair or maintenance there is no replacement for genuine factory parts. Turner Motorsport carries the Genuine BMW brand with pride and has the parts you need to complete your next project with confidence.
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Mahle-Behr - Corporate Logo
T#:341098
Part#: 11537509227
Ships in 1 Business Day
$ 104.39

This product was last offered at the strikethrough price on
08-14-2026

$ 104.28 USD
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$ 104.28 USD
Free Shipping

Replacement stock MAP thermostat with plastic housing and gasket for E46, E39, E60, X5, Z4 - M54 engine, M52TU engine. Your car may still operate fine according the instrument display but the electrically-operated thermostat may be going bad. This new thermostat includes the thermostat gasket, ready to install in your BMW.

Hailing from Stuttgart, Mahle-Behr specializes in automotive cooling systems. From air conditioning to engine cooling M-B has you covered with OE-quality replacement parts.

Applications:
1999-2003 E39 528i, 525i, 530i sedan, touring wagon (M52TU engine, M54 engine)
1999-2005 E46 323, 328, 325, 330 sedan, coupe, cabrio, touring wagon (M52TU engine, M54 engine)
2004-2005 E60 525i, 530i sedan, touring wagon (M54 engine)
2001-2006 E53 X5 3.0 (M54 engine)
2004-2006 E83 X3 2.5i X3 3.0i (M54 engine)
1999-2002 Z3 2.3. Z3 2.5i, 2.8 Z3 3.0i (M54 engine)
2003-2005 Z4 2.5i, Z4 3.0 (M54 engine)

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Genuine BMW - Corporate Logo
T#:2303
Part#: 11531318274-K
In Stock
$ 149.25 USD
Free Shipping
$ 149.25 USD
Free Shipping
Replacement stock thermostat for E46 M3, Z3M w S54 engine, Z4M.The thermostat can be replaced on the E46 M3 without removing the water pump. This can save you money if the pump still has life left on it but the thermostat needs to be done now. Symptoms of a bad thermostat include an erratic temp gauge and a fault code. When replacing the thermostat, there are three o-rings that will likely need to be replaced between the thermostat and the water pump housing, and two on the coolant tube going to the head. We also recommend new hoses, clamps, and BMW coolant. Replacement should take about one hour.

Note: even though this can be done without replacing the water pump, the job involves removing the same items to access this area. And opening the thermostat housing will spill a lot of coolant. In other words, if you don't replace the water pump at the same time, you're going to repeat this process when the pump needs replacing. We offer a complete water pump overhaul package that covers everything you need if you want to it all at once. You can the thermostat to that package and get everything without any duplicate parts. Click here for the E46 M3 water pump kit.

On S54 engines (E46 M3, MZ3, Z4 M) there is a flanged head bolt going into the cylinder head, behind the thermostat cover. This holds the left side timing chain guide rail in place and if it's loose or falls out you could have a very serious engine failure to deal with. Make sure to check this bolt while you have the thermostat cover off. You only need to make sure it's tight. But if it's come loose you may want to replace the seal ring and use a small touch of oil-resistant thread sealer.

This item fits the following BMWs:
2000-2001 E46 3 Series M3 M3 Convertible 2000-2006
2001-2002 Z3 Roadster / Coupe Z3 M Roadster Z3 M Coupe w S54 Engine
2006-2008 E86 E86 Z4 Z4 M Roadster Z4 M Coupe
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Genuine BMW - Corporate Logo
T#:348485
Part#: 17111437362
Ships in 1 day
4% off MSRP $ 134.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 130.00 USD
Free Shipping
4% off MSRP
$ 134.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 130.00 USD
Free Shipping

Ensure optimal performance and temperature regulation in your BMW's automatic transmission with the Turner Motorsport Genuine Automatic Transmission Thermostat, part number 17111437362. This thermostat serves as a crucial component of the heat exchanger system, maintaining proper fluid temperatures for smooth transmission operation. Typically replaced during expansion tank maintenance, this Genuine BMW part guarantees reliability and compatibility with your vehicle.

Key Benefits:

  • Genuine BMW quality assurance
  • Maintains proper transmission fluid temperatures
  • Ensures smooth transmission operation
  • Direct replacement for OEM thermostat
  • Compatible with expansion tank replacement
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Thermostat With Housing
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:582356
Part#: 11537509227
Ships in 1 Business Day
$ 89.99 USD
Free Shipping
$ 89.99 USD
Free Shipping
Stop leaks before they start with this new Thermostat With Housing from Rein.
Automatic Transmission Thermostat
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:13661147
Part#: 17111437362
Ships in 1 Business Day
$ 43.99

This product was last offered at the strikethrough price on
07-14-2026

$ 34.99 USD
Free Shipping on orders $49 and up
$ 34.99 USD
Free Shipping on orders $49 and up
This unit controls the temperature of your automatic transmission fluid
URO Parts Thermostat Assembly - 11537509227
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:29466801
Part#: 11537509227
In Stock
$ 41.99 USD
Free Shipping on orders $49 and up
$ 41.99 USD
Free Shipping on orders $49 and up

The thermostat cover in your BMW, made from plastic, is notorious for failing. After years of exposure to hot coolant, the plastic can crack, leading to significant coolant leaks and potential engine overheating.

URO Parts offers a superior solution with their high-quality thermostat cover, designed to surpass the durability of the original factory part. This replacement thermostat comes complete with a gasket for an effortless service.

Features:

Perfect Fit: Guaranteed fitment ensures a seamless replacement process. Optimal Cooling: High-flow OE-style design ensures efficient engine cooling performance. Easy Installation: Manufactured to factory housing dimensions for straightforward bolt-on installation and secure hose connections. Comprehensive Design: Includes ports for temperature sensors where applicable. Superior Materials: Constructed from high-quality alloy or composite materials that resist temperature-induced warping or cracking, preventing coolant leaks. URO Parts, with over 8,000 premium spare parts, specializes in manufacturing precise, durable replacements for factory BMW components. Committed to the highest standards of precision, materials, and workmanship, each part is rigorously tested to deliver the best combination of durability, functionality, and affordability. For reliable replacement parts that offer great value, choose URO Parts.

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Wahler - Corporate Logo
T#:362366
Part#: 11531318402
Ships in 3 Business Days
$ 6.17 USD
Free Shipping on orders $49 and up
BMW does not include a o-ring with their new thermostats

URO Thermostat Housing Gasket - BMW M52TU M54
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:639269
Part#: 11537509357
In Stock
$ 2.99 USD
Free Shipping on orders $49 and up
Prevent leaks with a brand new thermostat housing gasket from URO
Genuine BMW - Corporate Logo
T#:367704
Part#: 11537509357
Ships in 1 day
14% off MSRP $ 9.74

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 8.33 USD
Free Shipping on orders $49 and up
14% off MSRP
$ 9.74

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 8.33 USD
Free Shipping on orders $49 and up
Needs to be replaced once removed

Elring Thermostat O-Ring - BMW S54 3.2L
2X Entries Into Our F80 M3 Sweepstakes
Elring - Corporate Logo
T#:45278657
Part#: 293.300
Special Order: No Guaranteed ETA
$ 3.99 USD
Free Shipping on orders $49 and up
Seals the thermostat and thermostat housing to the water pump Replaces BMW # 11531318402
Thermostat - 80°C
10X Entries Into Our F80 M3 Sweepstakes
Bremmen Parts - Corporate Logo
T#:57507417
Part#: 11531318274
Ships on Jan 6, 2027
New Item
$ 59.99 USD
$ 59.99 USD